I know what you mean, something about them just makes me uneasy.
Well in my case I was robbed by Cpays about 4-5 years ago... maybe a little less then that... As i recall I hounded them over and over non stop daily sending like 100s and 100s of emails... over the course of a year or so and they finally paid me.
They are like Europartners - they hold you Hostage when they owe you money. Never ever allow companies like this to owe you money - they use it against you and turn you into a slave for them..
Cpays and Europartners invented this style and perfected it!!!!
As for William Hill direct - I would like to say i think they are different - and i know the old Cpays staff are gone - but who really knows for sure. Cpays was so connected and used bribes, and all kinds of things... maybe they still hold some power.
Whatever the case - for me personally i will need a healthy buffer to consider working with them.